The number of Shaf rules is one of the most important bridge bonds used in coordination chemistry. It has been used in the preparation of a large number of transition elements in particular and in the preparation of complexes with metal ions in general due to its coordination strength and also its ability to form complexes with different bases and different uses., and they are organic compounds containing the azomethine group (C=N-R R2). For the first time in the year (1864), I was the first to discover the process of condensing aliphatic ,aromatic ketones or aldehydes with primary aromatic amines or aliphatic, where the carbonyl group and primary amines are condensed so that the monoalkyl amine or monoaryl amine is added to the atom carbon of the carbonyl group belonging to the middle aldehyde or ketone. Later, the absence of the water molecule of the intermediate compound (N-substituted imine) which represents the base of the final shef result And why are there so many names, including amines, as well as when it is derived from a ketone, it is called ketamine, and when it is derived from an aldehyde, it is called an aldehyde. This biological activity of Scheff's rules also plays important roles in environmental chemistry, analytical chemistry, and industrial chemistry and is considered as a catalyst in photochemical reactions